Map of Storfjorden and Storfjorden Trough with ice-sheet extent at 22,000 years and ice streams indicated. Areas, where the shelf ice and ice streams broke up during atmospheric and ocean warming are marked with whitish colours. (A) Collapse during the first warming phase c. 15,000 years ago. (B) Collapse at the start of the present warm period (intergladial) 11,000 years ago. Black lines marked G4 to G1 are groundings lines where the ice stood still for an extended period of time.